Enhancement of pre-pulse and picosecond pedestal contrast of the petawatt J-KAREN-P laser

• DOI: 10.1017/hpl.2021.51
• Publication Date: 2021-11-02T04:55:56Z
• Authors: Hiromitsu Kiriyama; Yasuhiro Miyasaka; Akira Kon; Mamiko Nishiuchi; Akito Sagisaka; Hajime Sasao; Alexander S. Piro...; Yuji Fukuda; Koichi Ogura; Kotaro Kondo; Nicholas P. Dover; Masaki Kando
• Keywords: Chirped pulse amplification; Pedestal; Picosecond; Contrast ratio

Abstract We have experimentally improved the temporal contrast of petawatt J-KAREN-P laser facility. investigated how generation pre-pulses by post-pulses changes due to overlap between stretched pulse and post-pulse in a chirped-pulse amplification system. shown that time at which pre-pulse is generated its shape are related difference main post-pulse. With this investigation, we found identified origins demonstrated removal most eliminating with wedged optics. also impact stretcher optics on picosecond pedestal. realized orders magnitude enhancement pedestal improving optical quality key component stretcher.